A dynamic current limiting protection device and method
A current-limiting protection and dynamic technology, which is applied in the field of dynamic current-limiting protection devices, can solve problems such as excessive current stress and damage of power tubes, and achieve the effects of reducing current stress, improving system reliability, and real-time and fast protection
Active Publication Date: 2016-12-28
ZTE CORP
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Problems solved by technology
[0007] In view of this, the main purpose of the present invention is to provide a dynamic current limiting protection device and method, which can solve the problem that the power tube current stress exceeds the standard or is easily damaged when the output of the switching power supply in the digital control system is over-current or even short-circuited. Resume output immediately after load returns to normal
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[0034] The realization principle of a current limiting protection device in the prior art is as follows: figure 1 As shown, the output current sampling signal I of the power supply out Directly input to the output current detection module 104 for voltage division, output a current detection signal, the multi-level current limiting control module 103 adjusts the size of the current detection signal according to the input multi-channel control signal, and the adjusted current detection signal is input to the comparison module 105;
[0035] The current limit point reference module 102 provides a current reference signal. The magnitude of this signal is constant when the output is in the constant current limit section, and is proportional to the voltage detection signal output by the output voltage detection module 101 during the retraction section, so as to realize the retraction function, the current reference signal is input to the comparison module 105;
[0036] The respecti...
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The invention discloses a dynamic current-limiting and protective device and method thereof. The device includes: a retraction curve fitting module which is used for calculating a retraction current-limiting value at the present output voltage; an abnormal current protective module which is used for preliminarily protecting a detected abnormal current and setting an abnormal current flag; a current-limiting retraction loop given-current calculating module which is used for calculating a current-limiting retraction loop given-current value according to the retraction current-limiting value, the marked position of the abnormal current abnormal current flag and a voltage-output detecting signal; and loop a current-limiting retraction loop compensation module which is used for calculating and outputting the given frequency and the pulse width value of a power tube, and controlling the switching on and cutting off of the power tube. By employing the device and method of the invention, the power tube can be protected in real-time and quickly, and the current stress of the power tube is reduced when the output is over-current, even the output is short-circuited. The power tube is prevented from being damaged, and the system reliability is enhanced. When a load is back to normal, the normal output can be recovered immediately and the fault-recovering time is shorted.
Description
technical field [0001] The invention relates to a current limiting protection technology of a switching power supply, in particular to a dynamic current limiting protection device and method. Background technique [0002] Reliability is an important indicator of switching power supply, and output short circuit is a common output failure of switching power supply. If the output short circuit protection is not proper, it is easy to cause the current stress of the power tube in the switching power supply to exceed the standard or even be damaged. [0003] Currently, commonly used short-circuit protection control strategies include the following: [0004] The first one, when the output is short-circuited, the output current value will increase rapidly, and short-circuit protection will be performed after exceeding the set threshold value, and the output power tube will be turned off; however, this protection can only be restored after power-on again. [0005] The second type, w...
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IPC IPC(8): H02H7/10H02H3/06
Inventor 陈洲鲍胜华刘溪川王陶
Owner ZTE CORP